/Engine/Source/Runtime/Online/BuildPatchServices/Public/Interfaces/IBuildManifest.h
Gets a list of files that were installed with the Old Manifest, but no longer required by this Manifest.
void GetRemovableFiles ( const IBuildManifestRef & OldManifest, [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & RemovableFiles ) const